Projection system using a high-pressure discharge lamp adapted to d.c. lighting, and method of operating the same
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United States of America Patent
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Dec 11, 2007
Grant Date -
Jun 29, 2006
app pub date -
Apr 27, 2005
filing date -
Dec 28, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention provides a method of operating a projection system wherein light emitted from a high-pressure discharge lamp being lit with d.c. lamp current is passed through color segments of a color filter sequentially and then reflected by an optical element to project an image on a screen, the color segments of the color filter including red, green and blue color segments and a color segment comprising a green ND filter having a relatively low lightness. The method includes making lower a crest value of the d.c. lamp current fed to the high-pressure discharge lamp for a first illumination period during which the color segment comprising the green ND filter is illuminated than a crest value of the d.c. lamp current fed to the high-pressure discharge lamp for a second illumination period during which any one of the other color segments is illuminated, in synchronism with the first illumination period.
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